c语言学生成绩管理系统

好的，你想要一个简单的C语言学生成绩管理系统，以下是一个基本框架：

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

#define MAX_NUM 100

struct student {
    char name[20];
    int score;
};

int menu();
void add_student(struct student[], int);
void delete_student(struct student[], int);
void search_student(struct student[], int);
void print_all(struct student[], int);
void save_data(struct student[], int);

int main() {
    struct student students[MAX_NUM];
    int num = 0;
    int choice;

    // 从文件中读取之前保存的数据
    FILE *fp = fopen("data.txt", "r");
    if(fp != NULL) {
        while(fscanf(fp, "%s %d", students[num].name, &students[num].score) != EOF) {
            num++;
        }
        fclose(fp);
    }

    while(1) {
        choice = menu();

        switch(choice) {
            case 1:
                add_student(students, num);
                num++;
                break;
            case 2:
                delete_student(students, num);
                num--;
                break;
            case 3:
                search_student(students, num);
                break;
            case 4:
                print_all(students, num);
                break;
            case 5:
                save_data(students, num);
                return 0;
            default:
                printf("请输入正确的选项！\n");
                break;
        }
    }
    return 0;
}

int menu() {
    int choice;
    printf("学生成绩管理系统\n");
    printf("1. 添加学生\n");
    printf("2. 删除学生\n");
    printf("3. 查找学生\n");
    printf("4. 显示所有学生信息\n");
    printf("5. 保存并退出\n");
    printf("请输入您的选择：");
    scanf("%d", &choice);
    return choice;
}

void add_student(struct student students[], int num) {
    char name[20];
    int score;

    printf("请输入学生姓名：");
    scanf("%s", name);
    printf("请输入学生成绩：");
    scanf("%d", &score);

    strcpy(students[num].name, name);
    students[num].score = score;

    printf("添加成功！\n");
}

void delete_student(struct student students[], int num) {
    char name[20];
    int i, j;

    printf("请输入要删除的学生姓名：");
    scanf("%s", name);

    for(i = 0; i < num; i++) {
        if(strcmp(students[i].name, name) == 0) {
            for(j = i; j < num - 1; j++) {
                strcpy(students[j].name, students[j+1].name);
                students[j].score = students[j+1].score;
            }
            printf("删除成功！\n");
            return;
        }
    }
    printf("查无此人！\n");
}

void search_student(struct student students[], int num) {
    char name[20];
    int i;

    printf("请输入要查找的学生姓名：");
    scanf("%s", name);

    for(i = 0; i < num; i++) {
        if(strcmp(students[i].name, name) == 0) {
            printf("学生姓名：%s\n", students[i].name);
            printf("学生成绩：%d\n", students[i].score);
            return;
        }
    }
    printf("查无此人！\n");
}

void print_all(struct student students[], int num) {
    int i;
    printf("学生姓名\t学生成绩\n");
    for(i = 0; i < num; i++) {
        printf("%s\t\t%d\n", students[i].name, students[i].score);
    }
}

void save_data(struct student students[], int num) {
    int i;
    FILE *fp = fopen("data.txt", "w");
    for(i = 0; i < num; i++) {
        fprintf(fp, "%s %d\n", students[i].name, students[i].score);
    }
    fclose(fp);
    printf("数据已保存并退出！\n");
}

这是一个基本的学生成绩管理系统，包括添加、删除、查找、显示和保存数据等功能。你可以根据自己的需求进行修改和完善。